pH probe



FIG. 1 is a perspective view of a pH probe.

FIG. 2 is a front view of the pH probe of FIG. 1.

FIG. 3 is a back view of the pH probe of FIG. 1.

FIG. 4 is a left view of the pH probe of FIG. 1.

FIG. 5 is a right view of the pH probe of FIG. 1.

FIG. 6 is a top view of the pH probe of FIG. 1.

FIG. 7 is a bottom view of the pH probe of FIG. 1; and,

FIG. 8 is a front view of the pH probe of FIG. 1 having a cap.

Features shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a pH probe, as shown and described. 